How to separate incoming files based on the salesorg

Hi Experts,

I have an Idoc to File scenario. In the Idoc Field VKORG (sales organisation) based on its value the files should be placed in the respective folder in a server.(its a bypass scenario, hence mapping is not present)

For Example, SHPORD idocs are triggering with VKORG CA*, US*, AR* so all of these are going to a folder(*/invrt) but now i need specifically AR25, & AR26 to a different folder(*/invrtar) and it has only one receiver.

How can we do this in the ID part? Can We do it through routing?

This Scenario was in XI

Please provide me with some suggestions.